Research market value on Levels.fyi and Glassdoor, define your target and walk-away number, prepare your justification with data and competing offers, and get any offer in writing including all parts before responding.

Because it gives you clarity and confidence. Without a minimum, you cannot say no, and you might accept an offer that is too low out of fear or uncertainty. Deciding your walk-away before negotiating keeps you grounded.

So you can review all parts carefully, including base, bonus, equity, and benefits, instead of reacting to a verbal number. It also formalizes the offer and prevents misunderstandings later.